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Finding the Fourth Proportional to 937.49, 1,405.71 and 390.06

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Solution

The fourth proportional to 937.49, 1,405.71 and 390.06 is: 584.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.49 : 1,405.71 = 390.06 : x
  2. Step 2: Convert to fraction form
    937.49/1,405.71 = 390.06/x
  3. Step 3: Cross multiply
    937.49x = 1,405.71 × 390.06
  4. Step 4: Simplify right side
    937.49x = 548,311.24
  5. Step 5: Solve for x
    x = 548,311.24/937.49
  6. Step 6: Final answer
    x = 584.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.